Process of manufacturing corrugated tubes.



W. MAGIEJEWSKI. PROCESS' or MANUFAQTURING UORRUGATED TUBES, v

' APPLIOATION FILD JUNE 6, 191 1.

1,010,931. Pafentea Dec. 5, 1 911.

p To alli whom 'it concern:

Be it known that I, WLADYSLAW MAGIE- WLAD'srsLAw MACIEIJEWSKI, or WARSAW, Russin.

Specicati'on of Letters Patent.

' PROCESS OF MANUFACTURING CORRUGATED TUBES.

Patented Dec. 5, 191i'.

Application led June 6, 1911. Serial No. 631,618.

the tube at the places where the corrugations have to be produced, must be effected by 4 means of blow pipes, it being advantageous to rotate during this operation the Atube around its longitudinal axis.' Now, the dart of the blow pipe spreads out when meeting the wall of the tube and after an 'intensive heating of the determined zone slides along the smooth wallv of the tube. It is true that the thus produced heating ofthe neighboring parts of a tube having a cylindrical wall is not sointensive to be rable to exert an objectionable influence during the operation of pressing. However if in theimmediate neighborhood of the zone -subjectedto the heating there is a corrugation,=the latter opposes a certain Vresistance to the expansion of the flame; it follows therefromithat the zone of heating spreads over the corrugation considered and that when the tube is subsequently axially compressed, not only a new corrugatmn is formed but also an undesirable deformation of the neighboring wave is produced.- In this manner the corrugation previously formed-is always pressed in and impaired when the following 'corrugation 1s produced. Inorder to remedy this drawback, one has been obliged until now to produce the corrugations at relatively large intervals from each other vand this independently from the thickness of the wall of the tube and from the intensity of the source of heat in such a manner that the dart of,

the blow pipe striking the wall of the pipe would be unable even `after having been spread out, to reach and heat the neighboring corrugation. Therefore, in cases Where the tube has to be provided with corrugations continuing each other the process cited above cannot be employed. This limited possibility of applying the `process with i Y heating by zones of the tube andthe subsequent axlal pressing of the latter is corrected according to the present invention bythe i fact that during the heating of one zone on which the corrugation has to be formed, the neighboring surface of the tubez'. e. the surface which is positioned between the said zone of heating and the neighboring finished corrugation is insulated from'the action of 65 the flame andis cooled forA instance by placing Aon the tube a ring of fire proof material and by blowing or spraying on'the said su-n face of the tube or of the corrugation air .0r another gas or aA liquid or a mixture of liquid ,and air. This cooling and limitation of the neighboring corrugation prevents the undesirable heating of the neighboring wave produced by the lateral spreading of the dart of the blow pipe flame on thev wall of 75'..

the pipe and consequently the bending at a' non-desired spot during the compression. In the contrary the'formation 'of the corrugation when the axial. compression is pr'o`y duced is thus limited only to the place or ,zone .wherelthe heating has been performed. This process 'consequently allows even with tubes having thick walls and, requiring the use of intensive-sources of heat, to produce'v corrugations at any vdesired intervals".a11d 854 this also' in such a manner that, as thls 1s required in many' cases, the corrugations flow continuously into each other, which was @entirely impossible in the process lmown un-A tilV now.- The special formation or construc-V v of the cooling tion of the insulating ring, device as well as of the heating device is, as readily understood, an' arbitrary one;l it is preferably effected in such a manner that the'cooling device together with the heating 95 device is positively advanced step `by step as in the process described above-when'the heating of a determined zone has been effected to the required degree. The heating device may also be shaped in any desired manner although it beV recommendable to employ for it blow pipe dart flames. Considering this it may be advantageous or v even necessary to rotate the tube to. becorrugated while a determined zone is heated or cooled. The cooling fluid is supplied by means -of pipesl or nozzles which-may be arranged in a simple or multiple set at the periphery of the tube at a suitable distance from each other'. Theaction of the cooling 110. may be continued not only during the durap tion ofthe heating proper but also, if rerugated is itself quired, during the subsequent process of presslng.

The accompanying drawing, given by way of example, shows one form of embodiment of a device allowin of the execution of the process described a ve and in this drawing:

Figurelshows a side elevation viewfof the device,thetube to be corrugated being shown in longitudinal section; F1g. 2 shows a cross sectional View of the same.

The tube 1 to be corrugated has been shown as being provided already with a number offlinished corrugations and a new corrugation has to be formed at a and this in such la manner that like the corrugations ah'eady shown it immediately follows the last corrugation b or continues the latter. The zone heating of the tube is carried out at a by meansof blow pipe flames which are produced by'means of a mixture of air and gas supplied by pipes 2.v The tube t0 be corslowly rotated to this end. Now, according tothe presentinvention, before a new-corrugation is formed, a ring 4 made of fire proof material is applied to the tube and a cooling. medium "1s supplied through pipe 3 during the heating of the required zone of the tube 1. As shownby Fig. 1, the. said cooling medium flows against the neighboring corrugation band the insulatin ring so that the blowl'pipe iiame which, after havin met the vspot to 'be heated spreads vover t e surfaceof the tube, iskept away from the neighboring cor- `rugation b and rendered inoperativeby the insulation and the supply of the cooling medium. As further shownfby the drawing, the tube 3 supplying the cooling 1s liame by it and compresslng arranged on the'same carriage 5 which also carries the blow pipes producing the dart lames and is advanced step by step in the usual manner either by hand or bymeans of automatic devices.-

The insulating ring 4 may be removed and may easily be applied to any desired spot of the tube.

It will in some cases be suiicient to employ only one of said means i. e.V either only thecooling or only the insulation. This depends ,-'ineach peculiarcase upon the stren h ofthe lblow pipes and upon the dimensl'ons of the tube to be corrugated.

, Having now, fully described my said invention, what I claim and desire 'to secure by Letters Patent, is: Y Y

1. The herein described process of manufacturing corrugated tubes consistingin subjecting a tube to a forced {iame to heat same in zones, protecting the vnetal of the tube adjacent the heated zone from the. forced an insulated means and by cooling the tube axially.

2. IA process for l manufacturing corrugated tubes `consisting in heating the tube to be lcorrugated by zones, protecting the corrugation which heated, from the action of the flame by an insulating Ameans and by cooling it and compressing the tube. axially, substantially aslan'd for the purpose set forth In' testimony whereof I,'ha.ve hereunto set my hand in presence of two AVVLA- DYSLAW MCIEJEWSKI. Witnesses: I j W. KEMWJKI,

B. GLIszEnYNsKn..

is adj aoent to the zone to be 

